39 results about "Phosphorus pentachloride" patented technology

The utility model discloses an atomizing nozzle, a phosphorus pentachloride synthesis reactor and a phosphorus pentachloride synthesis system, which comprise a nozzle body, a first inlet, a second inlet, a third inlet, a fourth inlet, a fifth inlet and an outlet, the second inlet and the fourth inlet are both used for introducing first gas, and the fifth inlet is used for introducing second gas; the atomizing nozzle disclosed by the utility model can strengthen gas-liquid mixing and control the size and the shape of atomized particles, and in addition, the atomizing nozzle disclosed by the utility model is arranged on the reactor body, so that the distribution uniformity of materials in the space of the reactor body is improved, and a high-temperature area in the reactor body is reduced or eliminated.

This invention relates to a method for preparing high-purity phosphorus pentasulfide using a low-temperature liquid phase and its application, belonging to the technical field of key materials for lithium-sulfur batteries and solid-state batteries. It solves the technical problems of high reaction temperature and high energy consumption in existing phosphorus pentasulfide preparation processes. The method includes the following steps: Step 1: Select phosphorus pentachloride, dry it, and place the treated phosphorus pentachloride in an organic solvent to form a suspension or slurry system; Step 2: Place the suspension or slurry system in a closed reactor; Step 3: Introduce a sulfur source into the reactor to allow phosphorus pentachloride to undergo a sulfidation reaction with the sulfur source; Step 4: Raise the temperature to a set point and maintain a deep sulfidation reaction to generate phosphorus pentasulfide; Step 5: After the reaction, cool, separate the solid and liquid phases, and dry to obtain the solid product of phosphorus pentasulfide. This invention features mild reaction conditions, a simplified process flow, high safety, and recyclable solvents, making it suitable for continuous and large-scale production.

The utility model discloses a phosphorus pentafluoride generating system for a lithium hexafluorophosphate generator. The phosphorus pentafluoride generating system comprises a phosphorus pentafluoride generator, a phosphorus pentachloride feeding valve, a phosphorus pentafluoride reaction valve, a phosphorus pentafluoride feeding valve and a feeding emptying valve, one end of the phosphorus pentachloride feeding valve is connected to a phosphorus pentachloride positive pressure sending tank through a pipeline, the other end of the phosphorus pentachloride feeding valve is connected to one end of the phosphorus pentafluoride reaction valve through a pipeline, and the other end of the phosphorus pentafluoride reaction valve is connected to a feeding port of the phosphorus pentafluoride generator; a discharge port of the phosphorus pentafluoride generator is respectively connected to one end of the phosphorus pentafluoride feeding valve and one end of the feeding emptying valve through pipelines, the other end of the phosphorus pentafluoride feeding valve is connected to the lithium hexafluorophosphate generator through a gas filter, and the other end of the feeding emptying valve is connected to a tail gas collecting device through a pipeline. According to the utility model, the feeding misoperation can be eliminated, the feeding safety is ensured, and the feeding can be controlled to be correct.

The application discloses a phosphorus pentachloride feeding station, which comprises a feeding station frame; the feeding station frame is divided into a guide rail support, a waste bag collecting chamber, a unpacking chamber and a feeding chamber; the guide rail support is located at the top of the feeding station frame and is provided with a baffle on the bottom surface; the waste bag collecting chamber, the feeding chamber and the unpacking chamber are communicated with each other and are arranged in sequence from left to right and directly below the guide rail support; the whole conveying, unpacking and waste bag collecting of the application are in a closed space, so that harmful gas generated by unpacking and feeding is prevented from being discharged outside.

The utility model discloses a kind of even feeding devices for phosphorus pentachloride production, it is related to phosphorus pentachloride production technical field, including base, the top of base both ends is fixedly connected with U-shaped support seat, the top of base one end is fixedly connected with L-shaped support plate, both ends The top of U-shaped support seat is fixedly connected with heat-insulating jacket device, the inner side wall top of heat-insulating jacket device is fixedly connected with storage bin between, the bottom output end of storage bin is fixedly connected with electric valve, the other end of electric valve is fixedly connected with buffer tank, the base provided in the utility model, on the basis of realizing heat preservation protection to avoid affecting even feeding, increase inert gas protection to avoid causing metamorphosis simultaneously, to solve the temperature of the existing phosphorus pentachloride production feeding device is difficult to control due to lack of effective heat preservation structure, and lack of inert gas protection causes security and metamorphosis problem.

The utility model discloses phosphorus pentachloride anti-caking storage equipment which comprises supporting legs and a storage tank arranged on the supporting legs, the phosphorus pentachloride anti-caking storage equipment further comprises a heat dissipation assembly arranged in the storage tank, a storage cavity and a preparation cavity are sequentially arranged in the storage tank from top to bottom, the storage cavity and the preparation cavity are communicated through a discharging pipe, and the storage cavity is communicated with the preparation cavity. A first valve is arranged on the discharging pipe, the preparation cavity is communicated with the outside through a discharging pipe, a second valve is arranged on the discharging pipe, a flow dividing pipe, a first air inlet pipe, a first exhaust pipe, a second air inlet pipe and a second exhaust pipe are arranged on the storage tank, the first air inlet pipe is arranged on the storage tank and communicated with the storage cavity, and the second air outlet pipe is arranged on the storage tank and communicated with the storage cavity. A third valve is arranged on the first air inlet pipe, and the flow dividing pipe is arranged on the first air inlet pipe. The utility model relates to the technical field of phosphorus pentachloride storage, in particular to phosphorus pentachloride anti-blocking storage equipment which is not prone to being affected with damp, facilitates heat dissipation and is better in heat dissipation effect.

The utility model relates to the technical field of phosphorus pentachloride production devices, in particular to a phosphorus pentachloride production device which comprises a reaction box and a cover body covering the upper end of the reaction box, a stirring assembly is arranged on the cover body, and a filtering unit is arranged at the upper end of the cover body. The filtering unit comprises a shell and a Z-shaped plate, the shell is fixedly connected with the cover body, the Z-shaped plate is fixed with the shell through a fixing assembly, and a chlorine supply assembly is arranged on the lower side of the reaction box. Meanwhile, chlorine is continuously conveyed into the reaction box through the chlorine supply assembly and filtered through the filtering unit, a Z-shaped plate sealing structure is adopted, when activated carbon in a filtering frame is replaced, the lower side plate face of a Z-shaped plate can automatically seal the reaction box, chlorine leakage is effectively prevented, and the safety and operation convenience of the device are remarkably improved.

The utility model discloses a phosphorus pentachloride horizontal crusher, which belongs to the technical field of chemical machinery, and comprises an operation table, a horizontal linkage crushing component for carrying out horizontal double-roller crushing treatment on phosphorus pentachloride raw material solids, and an air suction sealing component for absorbing toxic gas generated by the raw materials and enhancing the sealing property, the air suction sealing assembly comprises a feeding air suction assembly and a sealing inflation assembly. The horizontal linkage smashing assembly is installed at the upper end of the operation table, the feeding air suction assemblies are installed at the upper end and the lower end of the horizontal linkage smashing assembly, and the two sealed inflation assemblies are installed at the side end of the horizontal linkage smashing assembly and distributed in a bilateral symmetry mode. In this way, the device is simple in structure and easy to implement, the smashing effect is improved, the maintenance rate of daily maintenance machines is reduced through the energy-saving machine, gas absorption and sealing protection are increased, and the quality of finished products is improved.

The invention relates to the technical field of organic synthesis, in particular to a preparation method of 2-chloro-6-trichloromethylpyridine. The method comprises the following steps: by taking 6-hydroxypyridine-2-carboxylic acid as a raw material, exposing an active group through acidification hydrolysis, then taking a composite solid-phase catalyst as a catalytic chlorinating agent, enabling the activated 6-hydroxypyridine-2-carboxylic acid to react with phosphorus pentachloride, carrying out primary chlorination on hydroxyl and carboxyl to obtain chlorine and acyl chloride, and continuously chlorinating acyl chloride to form trichloromethyl, by introducing the high-selectivity composite solid-phase catalyst, the problems of low yield and low selectivity in the existing preparation process of the 2-chloro-6-trichloromethylpyridine are solved, and meanwhile, the used catalyst is simple to recover.

The invention discloses tris (trimethylsilyl) phosphate and a preparation method thereof, and belongs to the field of chemical synthesis. The invention relates to a preparation method of tris (trimethylsilyl) phosphate, in particular to a preparation method of tris (trimethylsilyl) phosphate, which comprises the following steps: hexamethyldisiloxane and phosphorus pentafluoride are subjected to heating reaction under a stirring condition to obtain tris (trimethylsilyl) phosphate, and the molar ratio of hexamethyldisiloxane to phosphorus pentafluoride is (5-10): 1. Phosphorus pentachloride is replaced with phosphorus pentafluoride, and due to the fact that fluorine atoms are small in radius and large in electronegativity, phosphorus is high in electropositivity and small in steric hindrance, phosphorus pentafluoride can react with hexamethyldisiloxane more easily, a catalyst is not needed, the cost of tris (trimethylsilyl) phosphate can be greatly reduced, and the yield of tris (trimethylsilyl) phosphate is high.

The invention belongs to the technical field of medicines, and particularly relates to an isoflavone compound, a preparation method thereof and application of the isoflavone compound in preparation of a medicine for treating porcine epidemic diarrhea. The isoflavone compound is prepared by the following method: carrying out Friedel-Crafts acylation reaction on substituted phenylacetic acid and resorcinol under the catalytic action of boron trifluoride diethyl etherate to generate an acylated product; reacting DMF (Dimethyl Formamide) with phosphorus pentachloride to generate a Vilsmeier reagent; and carrying out condensation reaction on the acylation product and a Vilsmeier reagent to obtain the compound. In-vitro experiments prove that the isoflavone compound not only has good anti-PEDV (porcine epidemic diarrhea virus) activity, but also can remarkably relieve inflammatory response induced by PEDV. In addition, a fluorescence resonance energy transfer experiment is adopted, and it is verified that the isoflavone compound can inhibit PEDV 3C sample protease activity. The invention provides a candidate medicine for treating porcine epidemic diarrhea, and has important significance on development and innovation of isoflavone compounds.

The invention discloses phosphorus pentachloride production equipment and a production process thereof, relating to the technical field of phosphorus pentachloride production. The equipment comprises a reactor, wherein an air supply device and a liquid storage tank are provided on the outside of the reactor, a motor is fixedly connected to the bottom of the reactor, and an agitator is fixedly connected to the output shaft of the motor. Four nozzles arranged in an annular manner ensure that the phosphorus trichloride introduced into the reactor is evenly distributed. The device introduces phosphorus trichloride liquid by using the nozzles annularly distributed on the side wall of the inner cavity of the reactor. During the process of introducing the phosphorus trichloride, the nozzles cooperate with a trigger rod to push an inclined plate, so that the directions of the nozzles are periodically changed, so that the phosphorus trichloride falls into the interior of the reactor from four points. Compared with single-point pipeline transportation, the device can avoid the problem of phosphorus trichloride concentration enrichment near the transportation pipeline caused by long-term single-point transportation of phosphorus trichloride. Synchronous operation of the agitator can further enhance the distribution of the phosphorus trichloride and improve the subsequent mixing effect with chlorine.

The invention relates to the technical field of organic synthesis, in particular to 3-chloro-L-alanine hydrochloride and a preparation method thereof. The preparation method comprises the following steps: S1, continuously feeding a phosphorus pentachloride solution and a serine methyl ester hydrochloride solid into a dynamic tubular reactor for reaction, and carrying out solid-liquid separation, washing and drying on the reacted material to obtain 3-chloroserine methyl ester hydrochloride; and S2, mixing the 3-chloroserine methyl ester hydrochloride with hydrochloric acid, refluxing with boiling water, and drying to obtain the 3-chloro-L-alanine hydrochloride. According to the method, the reaction efficiency is greatly improved, meanwhile, the safety is good, the prepared product is high in yield and purity, and the method is suitable for industrial production.

The invention provides a treatment method of tail gas containing phosphorus pentafluoride and a preparation method and device of lithium hexafluorophosphate. The treatment method of the tail gas containing phosphorus pentafluoride comprises the following steps: 1) carrying out first absorption treatment on the tail gas containing phosphorus pentafluoride by adopting a first absorption liquid containing lithium fluoride to obtain a first lithium hexafluorophosphate solution and a first mixed gas containing hydrogen fluoride; 2) carrying out first reaction on phosphorus pentachloride and the first mixed gas to obtain second mixed gas containing phosphorus pentafluoride; and 3) carrying out second absorption treatment on the second mixed gas by using a second absorption liquid containing lithium fluoride to obtain a second lithium hexafluorophosphate solution and a third mixed gas containing hydrogen fluoride and hydrogen chloride. According to the treatment method of the tail gas containing phosphorus pentafluoride, provided by the invention, the content of phosphorus pentafluoride in the tail gas can be reduced, and the resource utilization rate is improved.

The application relates to the technical field of phosphorus pentafluoride preparation, and provides a phosphorus pentafluoride gas generator, which comprises a generator cylinder body and a filtering structure, the generator cylinder body is internally provided with a reaction cavity, the generator cylinder body comprises an upper cylinder body and a lower cylinder body, the upper cylinder body is provided with a first feeding port for feeding phosphorus pentachloride solids into the reaction cavity, and the lower cylinder body is provided with a second feeding port for feeding hydrogen fluoride liquid into the reaction cavity; the filtering structure is arranged between the reaction cavity and the second feeding port, and is used for permeating the hydrogen fluoride liquid and blocking the phosphorus pentachloride solids. The phosphorus pentafluoride gas generator provided by the application can make the hydrogen fluoride liquid and the phosphorus pentachloride solids fully contact in the reaction cavity by arranging the filtering structure for permeating the hydrogen fluoride liquid and blocking the phosphorus pentachloride solids, so that the reaction rate is improved, and the preparation efficiency of phosphorus pentafluoride gas is improved.

The present disclosure relates to a process for the preparation of ultra high purity alkali metal hexafluorophosphate (MPF6) comprising the steps of (a) charging alkali metal fluoride (MF) into a first reactor 'B' and flushing the first reactor 'B' with nitrogen, (b) cooling the first reactor 'B' to a predetermined temperature, the method comprises the following steps: (a) dissolving an alkali metal fluoride (MF) into a first reactor 'A', then charging anhydrous hydrogen fluoride (AHF) gas into a first reactor 'B' and stirring the mixture comprising the alkali metal fluoride (MF) dissolved in the AHF, (c) cooling the mixture comprising the alkali metal fluoride (MF) dissolved in the AHF in the first reactor 'B' to a predetermined temperature, (d) charging phosphorus pentachloride (PCl5) into a second reactor 'A' and adding the AHF in batches, the invention relates to a method for producing phosphorus pentafluoride (PF5) and hydrogen chloride (HCl) gas, (e) reacting alkali metal fluoride (MF) dissolved in AHF in a first reactor 'B' with a mixture of phosphorus pentafluoride (PF5) and hydrogen chloride (HCl) gas obtained in step (d) to obtain an alkali metal hexafluorophosphate mother liquor dissolved in AHF under the coverage of PF5 gas, (f) cooling the first reactor 'B' to a predetermined temperature, and (f) separating the alkali metal hexafluorophosphate mother liquor from the first reactor 'B' to obtain the phosphorus pentafluoride (PF5) and hydrogen chloride (HCl) gas. The present invention relates to a method for preparing an alkali metal hexafluorophosphate (MPF6), characterized in that the alkali metal hexafluorophosphate (MPF6), selected from NaPF6 or KPF6 or CsPF6, is dissolved in AHF, and the alkali metal hexafluorophosphate mother liquor dissolved in AHF is maintained at said temperature for a predetermined time, followed by filtration and drying at a predetermined temperature, to obtain the alkali metal hexafluorophosphate (MPF6) selected from the group consisting of NaPF6 or KPF6 or CsPF6.

The utility model discloses phosphorus pentachloride feeding reaction equipment which comprises a reaction kettle, a feeding assembly is mounted at the top of the reaction kettle, the feeding assembly comprises a mounting cover fixedly connected with the outer wall of the top of the reaction kettle, the mounting cover is communicated with the inner space of the reaction kettle, two connecting holes are formed in the middle of the mounting cover, and the connecting holes are communicated with the mounting cover. The interiors of the two connecting holes are rotationally connected with the same feeding ring through bearings, the circumferential outer wall of the feeding ring is attached to the circumferential inner wall of the mounting cover, a vertically-arranged storage cavity is formed in the middle of the feeding ring, a piston is slidably inserted into the storage cavity, and the inner walls of the two sides of the storage cavity are each provided with two limiting strips; according to the phosphorus pentachloride feeding device, through the arrangement of the feeding assembly, it is guaranteed that phosphorus pentachloride can be smoothly fed into the reaction kettle, meanwhile, poisonous gas generated by reaction cannot be mixed into the storage cavity, and the safety of the device can be improved.

The invention discloses a condensing device for phosphorus trichloride production, which comprises a source supply structure, a scraping device and a spray-assisted cleaning device, and the source supply structure can provide nitrogen and gaseous phosphorus trichloride; the scraping device is arranged at the left end of the top surface of the center of the source supply structure, and the left end of the scraping device can primarily remove phosphorus pentachloride generated in the right end; the spray-assisted cleaning device is arranged at the right end of the center top surface of the source supply structure, the moving end of the spray-assisted cleaning device is embedded into the right end of the scraping device, and the spray-assisted cleaning device can clean and collect phosphorus pentachloride in the right end of the scraping device in a centralized manner; the efficient cleaning of phosphorus pentachloride is realized through the cooperation of the scraping device and the spray-assisted cleaning device so as to improve the condensation quality of phosphorus trichloride, the potential safety hazard of contact with highly toxic and highly corrosive substances can be avoided without dismounting core components, and the inert environment is maintained through the matching sealing of the short pipe and the arc-shaped plate, the sealing of the rubber ring at the pipeline penetrating part and the dry nitrogen.

The preparation method comprises the following steps: dissolving phosphorus pentachloride in an n-hexane solvent, and preparing a phosphorus pentachloride solution with the concentration of 20 to 50 mmol / L; immersing the original chinlon in a phosphorus pentachloride solution for activation reaction to obtain activated chinlon; taking out the activated chinlon and removing the residual phosphorus pentachloride solution on the surface; the cleaned chinlon is immersed in a hyperbranched polylysine solution with the concentration of 15-30 wt% for a grafting reaction, and grafted chinlon is obtained; taking out the grafted chinlon, and removing residual substances on the surface of the grafted chinlon; and drying the washed chinlon to obtain the modified chinlon. According to the modified chinlon, a phosphorus pentachloride activation-hyperbranched polylysine grafting two-step method is adopted, the mechanical property of the chinlon is effectively protected while the efficient antibacterial and deodorizing functions are achieved, the antibacterial and deodorizing effect has good durability, and therefore the problems that in the prior art, modified chinlon is poor in antibacterial durability, large in fiber damage and the like are solved.

The application relates to a method for preparing high-purity phosphorus pentasulfide in a low-temperature liquid phase and application thereof, and belongs to the technical field of key materials for lithium-sulfur batteries and solid-state batteries. The method solves the technical problems of high reaction temperature and large energy consumption in the existing preparation process of phosphorus pentasulfide. The method comprises the following steps: step 1, selecting phosphorus pentachloride, drying the phosphorus pentachloride, and placing the treated phosphorus pentachloride in an organic solvent to form a suspension phase or a slurry system; step 2, placing the suspension phase or the slurry system in a closed reactor; step 3, introducing a sulfur source into the reactor to make the phosphorus pentachloride and the sulfur source undergo a sulfuration reaction; step 4, keeping the deep sulfuration reaction after being heated to a set temperature to generate phosphorus pentasulfide; and step 5, cooling, solid-liquid separation and drying after the reaction to obtain a phosphorus pentasulfide solid product. The application has the advantages of mild reaction conditions, simplified process flow, high safety, recyclable solvent and suitability for continuous and large-scale production.

The invention relates to the technical field of organic synthesis, and particularly discloses a preparation process of linear phenoxy phosphazene. The method comprises the following steps: adding ammonium chloride and phosphorus pentachloride into a solvent, and heating to 140-180 DEG C under the catalysis of an acidic ionic liquid to synthesize linear chlorophosphazene; after the reaction is completed, filtering the system while the system is hot, and pulping by adopting n-heptane to obtain linear chlorophosphazene; sequentially adding phenol and alkali into the solution, heating to 70 DEG C under the protection of nitrogen, and carrying out nucleophilic substitution reaction; and after the reaction is finished, concentrating the solvent, removing residual excessive phenol in the system through alkali washing, and washing with water until the system is neutral to finally obtain a white solid product, namely the target product linear phenoxy phosphazene. According to the process, the acidic ionic liquid is introduced as a synergistic catalyst, so that the temperature required by the ring-opening reaction of the cyclic phosphazene is remarkably reduced, the process safety is improved, the production energy consumption is also greatly reduced, and the process is an energy-saving, environment-friendly and efficient linear phenoxy phosphazene synthesis path.

The invention provides a preparation method of phosphorus pentafluoride. The preparation method comprises the following steps: reacting a raw material system comprising a porphyrin catalyst, fluorine-containing inorganic salt and phosphorus pentachloride to obtain phosphorus pentafluoride, the porphyrin catalyst comprises zinc ions and four carboxyl groups. The preparation method can be used for preparing high-purity phosphorus pentafluoride in a safer and more environment-friendly manner.

The application relates to the technical field of reaction kettle temperature control, in particular to a reaction kettle temperature stable control system and method for phosphorus pentachloride production, which comprises the following steps: collecting the chlorine consumption, the temperature in the kettle and the circulating water flow in the phosphorus pentachloride production process in real time; analyzing the correlation between the chlorine consumption and the circulating water flow in each sampling period to determine a trend reverse coefficient, and analyzing the trend change amplitude of the chlorine consumption and the circulating water flow and the correlation with the temperature to determine a trend amplitude influence coefficient; fusing the trend reverse coefficient and the trend amplitude influence coefficient to obtain a response adjustment coefficient, according to which the proportional parameter of a PID controller is dynamically adjusted, and the reaction kettle temperature in the next sampling period is controlled by using the adjusted PID controller. The application solves the problem that the traditional PID parameter fixation cannot adapt to temperature lag fluctuation, and improves the stability of the reaction kettle temperature control in the phosphorus pentachloride production process.

The present invention provides a mepivacaine preparation method, which comprises that in an organic solvent, 1-methylpiperidine-2-formic acid and 2, 6-dimethylaniline are subjected to a condensation reaction in the presence of a condensing agent to obtain mepivacaine, and the condensing agent is selected from one or more of phosphorus oxychloride, phosphorus trichloride and phosphorus pentachloride. The condensing agent used for preparing mepivacaine is one or more of phosphorus oxychloride, phosphorus trichloride and phosphorus pentachloride, toxic substances such as phosgene and the like are not generated, the safety is high, the cost is low, and the preparation method is suitable for industrial popularization.

This invention relates to a method for preparing compound (I) or a pharmaceutically acceptable salt or solvate thereof. In particular, such a method comprises the dehydration cyclization of a 1,2-diacylhydrazine intermediate to form the corresponding 1,3,4-oxadiazole, wherein the dehydration cyclizing agent may be N,N-dimethylaminosulfonyl chloride, N-(triethylammonium sulfonyl)carbamate, phosphorus trichloride, or phosphorus pentachloride, resulting in increased product yield and purity compared to known methods. Compound (I) and pharmaceutical compositions thereof can be used as respiratory syncytial virus (RSV) inhibitors.

The utility model relates to the technical field of phosphorus chemical production equipment, and particularly discloses a phosphorus pentafluoride gas reactor. Which comprises a reaction tank, a stirring shaft arranged in the stirring tank and a stirring motor for driving the stirring shaft to rotate, and is characterized in that the stirring shaft is horizontally arranged in the reaction tank; the technical problem that phosphorus pentachloride and anhydrous hydrogen fluoride cannot be uniformly mixed when phosphorus pentafluoride is prepared by a gas-solid reactor in the prior art is solved.

The utility model discloses a phosphorus pentachloride synthesis reactor and a continuous synthesis system, the phosphorus pentachloride synthesis reactor comprises a reactor body, a nozzle arranged at the top of the reactor body and at least one nozzle group arranged at the side part of the reactor body, and each nozzle group comprises at least two nozzles; the distance between the top of the reactor body and the adjacent nozzle group is 3-5 times of the inner diameter of the reactor body; according to the utility model, the plurality of nozzles are arranged on the reactor body in a layered manner, so that the distribution uniformity of materials in the space of the reactor body is improved, the heat exchange effect of the materials and a heat exchange medium is further improved, a high-temperature area in the reactor body is reduced or eliminated, and in some embodiments of the utility model, the temperature in the reactor can be controlled within 50-70 DEG C.

The invention discloses an efficient and environment-friendly synthesis method for phosphonitrilic chloride, which comprises the following steps: under the action of a composite catalyst and the protection of nitrogen, reacting phosphorus pentachloride PCl5 with ammonium chloride NH4Cl in a solvent, and after the reaction is finished, carrying out post-treatment to obtain phosphonitrilic chloride, the main effective component of the composite catalyst is nicotinic acid or nicotinoyl derivatives, the nicotinic acid derivatives are at least one of nicotinic acid or ammonium nicotinate and salts thereof, and the nicotinoyl derivatives are at least one of nicotinamide and salts thereof; the secondary effective component of the composite catalyst is Lewis acid. According to the method, nicotinamide is used as a novel efficient catalyst for chemical reaction, a brand new application of nicotinamide is achieved, when nicotinamide is used for replacing pyridine as a catalyst to be applied to a reaction for synthesizing hexachlorocyclotriphosphazene by taking phosphorus pentachloride and ammonium chloride as raw materials, the reaction time can be shortened, the reaction yield is obviously increased, and the method is suitable for industrial production. And a good technical effect is achieved.

The application belongs to the field of new energy, and discloses a preparation process of lithium hexafluorophosphate, which comprises the following steps: step 1: lithium fluoride and phosphorus pentachloride are reacted in an organic solvent to obtain a first mixture; and step 2: a fluorination reagent is added into the first mixture to obtain lithium hexafluorophosphate; the fluorination reagent is one or more of potassium fluoride, ammonium fluoride, calcium fluoride, potassium bifluoride and ammonium bifluoride. The process can obtain lithium hexafluorophosphate by a solvent method, and the yield is not less than 88%. Meanwhile, the application also discloses lithium hexafluorophosphate obtained based on the process.